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GJ 667 C e

GJ 667 C · M1.5 V host star · cool red dwarf · main sequence · existence disputed

[ GJ_667_C_E.IMG ]
VIEW 1 · ON THE SURFACE
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Artist’s impression of GJ 667 C e: VIEW 1 · ON THE SURFACE
VIEW 1 · ON THE SURFACE · Artist’s impression. No surface has been seen.
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23.6 light-years from Earth
[ FACTS.DAT ]
Right ascension / declination259.751° / -34.998°J2000 / ICRS
Gravity1.28 × Earthmodelled estimate
Year62.2 days
From its star0.2130 AUabout 31.9 million km. GJ 667 A and GJ 667 B ≥230 AU from GJ 667 C; those two are 5–20 AU apart
Stars in the system3 stars5 known planets in system
Stars this world orbits1 starOrbits GJ 667 C; not circumbinary
Day and nightLikely synchronous spinProbably spins once per orbit, keeping one hemisphere in permanent day and the other in permanent night. Heuristic: likely at ≤0.25 AU, uncertain to 0.50 AU, probably not beyond; rotation is not directly measured.
[ TEMP.EST ]MODELLED, NOT MEASURED
Host star≈3,650 Ktypical M1.5 V · 0.49 Sun radii
No atmosphere244 K · -29°C30% reflective · heat shared
Earth-like air277 K · 4°CBaseline plus 33°C

Star temperature and orbital distance set incoming energy, but stellar size is also required. This calculation uses a typical radius for the listed spectral type, 30% reflectivity and even heat redistribution. It is not a ground-temperature forecast: air, clouds, oceans and surface reflectivity could move the result by tens to hundreds of degrees. A likely synchronous spin also means the permanent day and night sides would not share one ground temperature.

[ STARLIGHT.SPC ]VISIBLE LIGHT ONLY

The marker above the bar is a typical temperature for this star’s class. The line below is Earth’s Sun.

red-orange

GJ 667 C is class M1.5 V. Its visible daylight would be dim and strongly red-orange; most of its energy is infrared.

Representative lit-side geometry only. On a locked world, the star’s real elevation would depend on where you stand.

[ GROUND.TXT ]STILL INFERENCE

Most plausible case. Only if the signal is a planet. It would receive about 30% of Earth’s light at 0.21 AU, a cold orbit around the same 3350 K star. The star would span under a degree. Ice and frost would dominate, with bare rock only if the greenhouse is strong. Several later studies argue e and f may be stellar activity, so this ground is conditional.

Dry case. Cold rock and dust. Not a hot desert. The low flux is the whole story if the air is thin.

Thick-air case. A thick CO₂ atmosphere is what would make the ground temperate. It would also hide the surface.

Walking. About 28% heavier than Earth, and that mass is as disputed as the planet. Planet f would be a modest disk, about a quarter of the Moon’s width, and only if both signals are real.

Based on: Anglada-Escudé et al. 2013; contested by activity studies; S 0.30, a 0.213 AU, controversial flag

[ ORBIT.SYS ]5 KNOWN · ALL SHOWN
100% · Above 30°

GJ 667 C e circles GJ 667 C alone. GJ 667 C is at least 230 AU from the A–B pair; A and B vary from about 5 to 20 AU apart. Also shown: GJ 667 C b, GJ 667 C c, GJ 667 C f, GJ 667 C g, each on its NASA-catalogued orbit. Use Higher and Lower to move your viewpoint above, through and below the orbital plane, and − / + to zoom. Orbit shapes and spacing are schematic.

[ SOURCES.TXT ]

Positions, distances, and system parameters come from the NASA Exoplanet Archive composite table, queried 25 Sep 2026. GJ 273 b uses the parallax in that row, 12.4 light-years. The 45 worlds follow Bohl, Lawrence, Lowry, and Kaltenegger.